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3.2
System solution
3.2.1
Unvented package installation, DHP-H and DHP-A models
10 11
91
96
DHP-H
DHP-A
Figure 3.
The principal installation solution of the unvented package on DHP-H and DHP-A models.
Position
Name
10
Supply line heating system
11
Return line heating system
12
Cold water
80
Shut-off valve
85
Venting valve
86
Safety relief valve heating system
91
Strainer
96
Flexible hose
110
Expansion vessel
113
Expansion heating system
126
Factory fitted combined Temperature and pressure relief valve*
128
Double check valve with Shut-off valve
129
Unvented manifold assembly: Pressure reducing valve, Safety relief valve, Non-return valve
132
Flexible hose Unvented package
*
) The water heater tank in DHP-H and DHP-A models is factory fitted with a Temperature and pressure relief
valve . The connection from this valve must not be used for other purposes other than discharge pipe con-
nection . Please see chapter 5 .3 Discharge pipe arrangement .
DD E D
N ote! No valve should be fitted between the safety relief valve and the storage cylinder .
12
86
113
85
132
126
110
80
96
80
128
129
80
Unvented manifold assembly
(see figure 1)
12
Appendix UK – 9